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A gametangium (pl.: gametangia) is a sex organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In contrast to gametogenesis in animals , a gametangium is a haploid structure and formation of gametes does not involve meiosis .
Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top) Alternation of generations (also known as metagenesis or heterogenesis) [1] is the predominant type of life cycle in plants and algae.
After meiosis the female gametangium (or egg) bends at an angle so that the sperm can attach and enter the egg. the site of entry by the sperm starts to swell as the cytoplasm is sent to the area. after fertilization the auxospore forms at this site, the cytoplasm then contracts and valves (distinct halves of the cell wall) form to create the ...
gametangium (pl. gametangia) gametophyte. gene-for-gene hypothesis. general resistance (syn. horizontal resistance, race non-specific resistance) genotype. germ theory. giant cell. girdle. giant cells. gram-negative. Gram-negative bacteria are those that do not retain crystal violet dye in the Gram staining protocol. gram-positive
As it approaches a mate, a haploid sac fungus develops one of two complementary organs, a "female" ascogonium or a "male" antheridium. These organs resemble gametangia except that they contain only nuclei.
A very fine hypha, called trichogyne emerges from one gametangium, the ascogonium, and merges with a gametangium (the antheridium) of the other fungal isolate. The nuclei in the antheridium then migrate into the ascogonium, and plasmogamy—the mixing of the cytoplasm—occurs.
Marchantia berteroana is a flat, thalloid liverwort, with thallus up to 2 cm (0.79 in) long and 1.2 cm (0.47 in) wide.The thallus colour can range from dark green to yellow with a glossy surface, and is attached to the ground via rhizoids.
In phycology and mycology, oogonium refers to a female gametangium if the union of the male (motile or non-motile) and the female gamete takes place within this structure. [ 12 ] [ 13 ] In Oomycota and some other organisms, the female oogonia, and the male equivalent antheridia , are a result of sexual sporulation, i.e. the development of ...